Optical Budget Calculation For Serial Communication With Spa/Iec - Hitachi Relion RES670 Commissioning Manual

1MRK 511 409-UUS Rev. K
6.4 Optical budget calculation for serial communication with
SPA/IEC
Table 9:
Maximum attenuation
4 dB/km multi mode: 820 nm - 62.5/125 um
0.16 dB/m plastic: 620 nm - 1mm
Margins for installation, aging, and so on
Losses in connection box, two contacts (0.5 dB/contact)
Losses in connection box, two contacts (1 dB/contact)
Margin for 2 repair splices (0.5 dB/splice)
Maximum total attenuation
Phasor measurement unit RES670
Commissioning manual
Example
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Establishing connection and verifying the SPA/IEC communication
Distance 1 km Distance 25 m
Glass Plastic
- 11 dB - 7 dB
4 dB -
- 4 dB
5 dB 1 dB
1 dB -
- 2 dB
1 dB -
11 dB 7 dB
Section 6
M11736-4 v2
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